1997 Throttle position sensor setting
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,064
Likes: 2,092
From: Ohio
Having some fun, your pointing him in the right direction with experiance and that is priceless. EFI repairs needs everyone to post experiance to help.
Does the new Cobra tuner work with the 95-96"s ? have no experiance with the latest Cobra deal
Does the new Cobra tuner work with the 95-96"s ? have no experiance with the latest Cobra deal
Thread Starter
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Cruiser
Joined: Jun 2012
Posts: 184
Likes: 2
From: North Bend Ohio
Switching to the updated 97-98 ECM was the bullentin for a ECM that had the ability to be reflashed or altered by a tuner, the 95's were locked. TPS setting can be checked but you are kinda doing a bandaid repair by altering a TPS to get a richer condition but checking it won't hurt.
Copied this from someone smarter than me, I have a 97 ECM if that is a direction you need to go.
First, back out the warm and cold idle screws so they're not affecting anything. Then disconnect the ISC actuator.
Backprobe (with a pin or anything small like that) the right-most wire on the TPS connector. Connect the positive lead of your multi-meter to that pin; ground the negative lead. With the ignition on and the engine cold, rotate the TPS until you get a voltage reading of .275. Tighten the screws being careful not to change the reading.
Next, turn the cold idle screw in until you get a reading of .60 to .64 volts.
Next, turn the warm idle screw in enough so the bike will idle. Warm the engine, and adjust warm idle to taste (about 1000 rpm's).
Copied this from someone smarter than me, I have a 97 ECM if that is a direction you need to go.
First, back out the warm and cold idle screws so they're not affecting anything. Then disconnect the ISC actuator.
Backprobe (with a pin or anything small like that) the right-most wire on the TPS connector. Connect the positive lead of your multi-meter to that pin; ground the negative lead. With the ignition on and the engine cold, rotate the TPS until you get a voltage reading of .275. Tighten the screws being careful not to change the reading.
Next, turn the cold idle screw in until you get a reading of .60 to .64 volts.
Next, turn the warm idle screw in enough so the bike will idle. Warm the engine, and adjust warm idle to taste (about 1000 rpm's).
Stellar HDF Member
Joined: Feb 2007
Posts: 2,558
Likes: 280
From: Russellville, Arkansas
To really set the TPS correctly, it's just about impossible to set without a breakout box. I know most are not going to have the breakout box just laying around....here is what I did.
When the check engine light was on and I knew the TPS was out of adjustment. I would adjust the TPS while engine running and check engine light on. Keep adjusting the TPS until the check engine light would go off. At this point, the ECM believes the TPS is within range. I know this was not the right procedure, but it worked for me. Since then, I've purchased the breakout box.
Before you go messing around with the TPS, make sure everything else is set up properly. Cold/Hot idle settings adjustment right and the idle control motor are working.
Are you sure the TPS is the problem?
When the check engine light was on and I knew the TPS was out of adjustment. I would adjust the TPS while engine running and check engine light on. Keep adjusting the TPS until the check engine light would go off. At this point, the ECM believes the TPS is within range. I know this was not the right procedure, but it worked for me. Since then, I've purchased the breakout box.
Before you go messing around with the TPS, make sure everything else is set up properly. Cold/Hot idle settings adjustment right and the idle control motor are working.
Are you sure the TPS is the problem?
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,064
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From: Ohio
Ya, I don't think I would condim the TPS, the Cobra doesn't read TPS and didn't see anything in the instructions from Cobra about TPS settings unless I missed it. I think you have a base problem with the M&M as the Cobra is a piggyback system and only altering the injector pulses from the ECM, I wouldn't rule out a engine temperature sensor acting up, it can act up without sending a check engine light, the ETS can lean out or flood it.
If it stumbles and pops through the intake is pointing to lean, a ETS can be irattic and stay in cold mode continueing to add fuel plus the Cobra is also adding so the engine can stumble from flooding, try and feel that out. The Cobra has 0 settings, could take it for a short ride too see if runability is all over the place without the Cobra and try to determine a base problem.
I guess with no O2 sensors, the autotune is just locked in a setting? just asking for my own knowledge.
If it stumbles and pops through the intake is pointing to lean, a ETS can be irattic and stay in cold mode continueing to add fuel plus the Cobra is also adding so the engine can stumble from flooding, try and feel that out. The Cobra has 0 settings, could take it for a short ride too see if runability is all over the place without the Cobra and try to determine a base problem.
I guess with no O2 sensors, the autotune is just locked in a setting? just asking for my own knowledge.
Last edited by 1997bagger; Aug 27, 2012 at 11:08 PM.
Stellar HDF Member
Joined: Feb 2007
Posts: 2,558
Likes: 280
From: Russellville, Arkansas
Ya, I don't think I would condim the TPS, the Cobra doesn't read TPS and didn't see anything in the instructions from Cobra about TPS settings unless I missed it. I think you have a base problem with the M&M as the Cobra is a piggyback system and only altering the injector pulses from the ECM, I wouldn't rule out a engine temperature sensor acting up, it can act up without sending a check engine light, the ETS can lean out or flood it.
If it stumbles and pops through the intake is pointing to lean, a ETS can be irattic and stay in cold mode continueing to add fuel plus the Cobra is also adding so the engine can stumble from flooding, try and feel that out. The Cobra has 0 settings, could take it for a short ride too see if runability is all over the place without the Cobra and try to determine a base problem.
I guess with no O2 sensors, the autotune is just locked in a setting? just asking for my own knowledge.
If it stumbles and pops through the intake is pointing to lean, a ETS can be irattic and stay in cold mode continueing to add fuel plus the Cobra is also adding so the engine can stumble from flooding, try and feel that out. The Cobra has 0 settings, could take it for a short ride too see if runability is all over the place without the Cobra and try to determine a base problem.
I guess with no O2 sensors, the autotune is just locked in a setting? just asking for my own knowledge.
Correct me if I am wrong....but I don't think the 1995 models had a check engine light. I only thought the 1996-up had them.
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,064
Likes: 2,092
From: Ohio
Correct me if I am wrong....but I don't think the 1995 models had a check engine light. I only thought the 1996-up had them.
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Joined: Aug 2010
Posts: 3,486
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From: Union,Ms
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,064
Likes: 2,092
From: Ohio
Hey guys, I've done a little research and found this thread on a 1995 Ultra https://www.hdforums.com/forum/touri...ring-ride.html
Seasoned HDF Member
Joined: Apr 2012
Posts: 9,970
Likes: 5,207
From: Michigan
Don't want to hi-jack this thread as I have a 2000 Ultra with the MM EFI system and I've had a h**l of an ongoing problem that may contribute to this discussion.
My bike has nearly 79,000 miles on it and it has a 1550 kit (Stage II).
Recently, it got to where is had a constant miss/surge at any constant speed or RPM.
After doing the normal tune up stuff I took it to an indy shop and he thought it was leaking intake seals so I had him install them.
Seemed like it was better for day or two (probably my imagination).
I purchased, and installed a new TPS and simply set it to where the engine would maintain about 1000 RPM's at warm idle, however it still had the same miss/surge at constant speed/RPM.
Back to the shop.
Indy checked all wiring and finally got the bike to "code" after installing a new Engine Temp Sensor which indicated that the ECM was defective.
He ordered a new ECM (which I think he says has been updated about 5 times since my bike was built) and also a new "flash" update for the Stage II.
The new ECM has a USB port that requires updates to be done via a laptop computer.
I've been riding the bike for about a week to see what I think it needs and will take in back after the weekend for some "tweaking".
The bike runs better (so the new stuff defnitely helped) but is still not perfect but the indy (who took a 40 hour class on the MM EFI system) believes that it is now a matter of syncing the TPS to the new ECM and obviously this is not just a set to a certain spec and that's it.
It's more of a of trial and error thing and getting it dialed in correctly.
I'll update IF an WHEN we get the bike running good.
Good luck.
My bike has nearly 79,000 miles on it and it has a 1550 kit (Stage II).
Recently, it got to where is had a constant miss/surge at any constant speed or RPM.
After doing the normal tune up stuff I took it to an indy shop and he thought it was leaking intake seals so I had him install them.
Seemed like it was better for day or two (probably my imagination).
I purchased, and installed a new TPS and simply set it to where the engine would maintain about 1000 RPM's at warm idle, however it still had the same miss/surge at constant speed/RPM.
Back to the shop.
Indy checked all wiring and finally got the bike to "code" after installing a new Engine Temp Sensor which indicated that the ECM was defective.
He ordered a new ECM (which I think he says has been updated about 5 times since my bike was built) and also a new "flash" update for the Stage II.
The new ECM has a USB port that requires updates to be done via a laptop computer.
I've been riding the bike for about a week to see what I think it needs and will take in back after the weekend for some "tweaking".
The bike runs better (so the new stuff defnitely helped) but is still not perfect but the indy (who took a 40 hour class on the MM EFI system) believes that it is now a matter of syncing the TPS to the new ECM and obviously this is not just a set to a certain spec and that's it.
It's more of a of trial and error thing and getting it dialed in correctly.
I'll update IF an WHEN we get the bike running good.
Good luck.